Assignments are valid for a maximum of 10 days, but it's preferred that you take only about one day's worth of assignments at once.Ideally you should use the provided scripts (Windows | Linux) to automate getting assignments and submitting results.If you need to submit manual results you can do so here.

Run from a RAM drive, since worktodo.txt and results.txt are read and written multiple times per second. I use a 10MB drive with DataRAM RAMdisk.

If running from a RAMdrive you should select a work fetch quantity that you can complete within an hour or so to minimize any risk of lost work. The default of 1000 assignments is likely appropriate for most cases.